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CVE-2026-13447

CRITICAL 9.8 CVSS 3.1
Published
September 5, 2026
Last modified
September 8, 2026
NVD status
Deferred
Reported by
security@wordfence.com
Weakness
CWE-287
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Description

The Mstore Api plugin for WordPress is vulnerable to Authentication Bypass via JWT Forgery in versions up to, and including, 4.20.0 This is due to missing cryptographic signature verification in the FirebasePhoneAuthHelper::verify_id_token() function, which decodes and validates Firebase ID token claims (alg, kid, aud, iss) but never calls openssl_verify() or any equivalent to validate the JWT signature against Google's actual public key certificates. This makes it possible for unauthenticated attackers to forge a Firebase Phone Auth JWT signed with a self-generated RSA key pair and impersonate any phone number, resulting in unauthorized access to existing WordPress accounts or creation of new arbitrary accounts.

Affected WordPress components

  • MStore API – Create Native Android & iOS Apps On The Cloud Plugin · mstore-api
    Confirmed match Active
    Up to and including 4.20.0
    View on WordPress.org

A confirmed match is backed by the plugin or theme slug. A possible match is based on the product name only and should be verified.

Affected products and versions

  • inspireui MStore API – Create Native Android & iOS Apps On The Cloud — Up to and including 4.20.0

References

  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/mstore-api/tags/4.18.4/controllers/flutter-user.php#L829
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/mstore-api/tags/4.18.4/controllers/flutter-user.php#L940
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/mstore-api/tags/4.18.4/controllers/helpers/firebase-phone-auth-helper.php#L5
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/mstore-api/trunk/controllers/flutter-user.php#L829
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/mstore-api/trunk/controllers/flutter-user.php#L940
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/mstore-api/trunk/controllers/helpers/firebase-phone-auth-helper.php#L5
  • www.wordfence.com https://www.wordfence.com/threat-intel/vulnerabilities/id/4a1127af-74f6-4748-9aee-5a8c6c2766a4?source=cve
  • nvd.nist.gov Official NVD record